Gas furnace



l March 20, 1934. R. E. FRASER GAS FURNACE .Filed April 25, 1932.

2 Sheets-Sheet l INVENTOR Maser BY L? .um

ATTORNEY R. E. FRASER 1,952,009

`GAs FURNACE Filed April 23. l1932 2 SheetS-Sheet 2 lllllllllll- INVENTOR ATTORNEY Patented Mar. 2o, 1934 UNITED STATE-s 952,009 Gas FUnNAoE Richard Fraser, Stockton, Calif., assigner to Fraser Furnace Company,` Stockton, Calif., a

corporation Application A prll 23, 1932, Serial No. 607,123 1 claim. (cl. 12s-11s) This invention relates to gas floor furnaces and yis a continuation inpart of my application for patent, Serial No. 349,611, led March 25, 1929.

The principal object of this invention is to imy I prove the construction of furnaces of this type so as to increase their heating output with no increase in size or fuel consumption, by constructing and arranging the gas passage and heat radiating members of the furnace in such a way that a great volume of air will be evenly heated and a very large percentage of the heat units in the gas utilized, with a consequent high efliciency of the furnace. A further object is to construct the furnace so l5 that the compactness necessary in this particular type is maintained, coupled with great efficiency and simplicity and inexpensiveness of construction and manufacture.

The objects I accomplish by ,means of such structure and relative arrangementof parts as1 will fully appear by a perusal of the following specification and claim.

In the drawings similar characters of reference'indicate corresponding parts in the several views: v

` Fig. 1 is a sectional end elevation of my improved furnace of the oor type, shown partly in section.

Fig. 2ris a top plan view of the furnace with the $0 top grate mostly broken away. Referring now more particularly to the characters of reference on thedrawings, the numeral 1 denotes a grate to rest on the floor, from adjacent the periphery of and secured to which a rectangular casing 2 depends. Supported on and projecting upwardly from the bottom 3 of the casing is the main gas chamber 4, freely open on the bottom and there connected to an open bottomed frame or casing 5, depending below the casing 2. This lower casing supports the gas burner 6 of -suitable character and of a shape symmetrical with that of the chamber. The chamber terminates short ofthe top grate and has a centrally disposed and removable peep-hole cap 'I thereon.

On one side near the top the chamber communicates with separate vertical circular drums by means of lateral and relatively restricted outlets 9; said drums having cylindrical-passages 10 therethrough concentric therewith and open to the area enclosed by the main casing both at top and bottom.' The outlets 11 from the drums are adjacent the bottom and on the sides opposite to the intakes 9, and lead to the exterior of thecasing 2 and are there connected to a common manifold 12 from which a single ilue 13 leads. The

.spaced intervals about the same are hollow fins 14, open to the interior of the chamber and extending from top to bottom of the same. .There are more of these fins on the side of the chamber opposite the drums than on the drum side, since said drums while spaced from the chamber are too close to permit of the fins being used except between and beyond the drums, as clearly shown in Fig. 2. Y

A double-walled inner casing l5 is secured to and dpends from the grate inwardly of the casing 2 and extends in surrounding relation to the structure below to a termination-some distance short of the bottom 3. The inner casing is arranged so that it clears the outsides of the drums slightly and also clears the outer ends of the end iins and the opposite side ns of the casing a correspond ing distance. Air intake openings 16` are cut through the outer wall surface at the bottom, and similar openings 17 are cut through the in-` ner wall surface at 'the top. A

Semicircular horizontal bales 18 are mounted in the drums just above their outlets and on thesame side; said baiiles extending between and contacting with the drum walls and those of the inner cylindrical passages 10. l

In operation the flow of gases from the burnerV to the outlet ue 13 will be self-evident. The use of cylindrical drums provides a relatively great air-flow space about the drums and between the same and the chamber which permits of an uninterrupted upward iiow of air as is necessary for eiciency; and at the same time gives plenty of room for welding /the outlet connections together while maintaining the drums and chamber in very compact relationship. The ns projecting between the drums and in overlapping relation to the same at the corners of the chamber cause such upwardly flowing volumes of air to -absorb a considerable amount of heat from the fins so that the air is thoroughly heated while at the same time the furnace chamber iskept cooll and overheating of the metal walls thereof is prevented.

The cylindrical drums also cause the gases entering .the same to whirl about and come in full contact-with all the surface area of the drum walls, thus delivering all possible heat units to said walls `which in turn is radiated to the surrounding air. 4

The arrangement of the outlet manifold and smothering of the llame which would be had if the drums depended below the outlet;- while .the outlet being'above the level of the burner prevents the killing of the fiame which would be obtained if the outlet was at or below such level. Also the bottom of the drums being above the bottom and naturallyhottest portion of the main heating chamber, the upwardly reflected heat from said hottest portion of the chamber/keeps the bottom of the drums hotter than would otherwise be the case and has a tendency to prevent condensationin the bottom area of the drums.

The double walled intermediate casing 15 with the air openings which permit thel intake of cold air to the space between said walls at the bottom and the discharge of air into the main air discharging area of thefurnace at the top 'of said casing, not only provides additional heat radiation and air heating capacity in the furnace, but keeps the cold air passage area outwardly of said casingin a cooler condition than would otherwise be the case. This is because the continuous flow of initialy the intermediate casing draws off considerable heat from the casing walls'and prevents the outer wall of the same from materially heating up. The incoming down draft of air therefore is kept cool and the temperature difference between such air and that -in the furnace area proper is relatively great. As a consequence the velocity of such incoming air is increased with a consequent increasein furnace efficiency over one in which the flow of air to be heatedis sluggish due to a lack of suiilcient temperature difference between the hot and cold airflow.

The drums 8 being on one side of the main heating chamber only, the necessary connection with the outlet flue may be kept very simple and compact without the use of a plurality of manifolds and ues or without a' plurality of intercommunicating Opassages of diierent sizes, one or the other of which arrangements would be necessa'ry 'if the ere disposed on' both sidesof the chamber. f V

cold air between the ldouble walls ofg y :,eeaooa `flue at the bottom ofthe drums avoids the The bales 18 preventthe gases from owing straight down between the intakes and outlets of the drums and cause such gases before reaching the outlets, to sweep the walls of the `drums adjacent the furnace chamber, thus imparting great heat thereto with a corresponding great and eiiicient heating of lthe cold air currents passing up between the furnace chamber and the The gases are alsocaused to sweep the bottom walls of the drums, thus further aiding to prevent condensation.

From the foregoing description it will be readily seen thatI have produced such a device as substantially fulfills the objects of the invention as -set forth herein.-

whne this specincanon sets 4man in detan the' present and preferred construction of the device, still in practice such deviations from suchvdetail may be resorted to as do not1 form a departure from the spirit of the invention, as defined by the appended claim.

Having thus described :nyinvention what I claim as new and useful and desire'to secure by Lettersl Patent is:

A gas furnace comprising an enclosed casing adapted to be suspendedvfrom a. dwelling floor,

an open bottomed casing mounted on and depending below the bottom of said floor casing, a gas burner assembly mounted inthe open bottomed casing and below the bottom. of the floor casing,

a mainl gas chamber resting on the bottom of the iioor casing in surrounding relation to and in open ncommunication with the open bottomed casing and 'extending to a point adjacent the top of the oor casing. a vertical drum. to one side o f and adjacent the chamber, said drum having anair passage therethrough' from top to bottom,

the lower end of the drum being spaced above the bottom of the floor casing, a gasintake passage between the chamber and the drum adjacent the topthereo'f, and an'outlet passage from one side of the drum at the lower end l'thereof andahoril zontal baille in the drum just above and on the same side asthe outlet. 

